29.5.15 Client Address Mask
| Name: | SADDRMASK |
| Offset: | 0x0E |
| Reset: | 0x00 |
| Property: | - |
| Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| ADDRMASK[6:0] | ADDREN | ||||||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | R/W | R/W | |
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
Bits 7:1 – ADDRMASK[6:0] Address Mask
The ADDRMASK bit field acts as a second address match or an address mask register depending on the ADDREN bit.
If the ADDREN bit is written to ‘0’, the ADDRMASK bit field can
be loaded with a 7-bit Client Address mask. Each of the bits in the Client
Address Mask (TWIn.SADDRMASK) register can mask (disable) the corresponding
address bits in the TWI Client Address (TWIn.SADDR) register. When a bit from
the mask is written to ‘1’, the address match logic ignores the
comparison between the incoming address bit and the corresponding bit in the
Client Address (TWIn.SADDR) register. In other words, masked bits will always
match, making it possible to recognize the ranges of addresses.
If the ADDREN bit is written to ‘1’, the Client Address Mask
(TWIn.SADDRMASK) register can be loaded with a second client address in addition
to the Client Address (TWIn.SADDR) register. In this mode, the client will have
two unique addresses -- one in the Client Address (TWIn.SADDR) register and the
other in the Client Address Mask (TWIn.SADDRMASK) register.
Bit 0 – ADDREN Address Mask Enable
If this bit is written to ‘0’, the TWIn.SADDRMASK
register acts as a mask to the TWIn.SADDR register.
If this bit is written to ‘1’, the client address match logic
responds to the two unique addresses in the client TWIn.SADDR and TWIn.SADDRMASK
registers.